netdev - Re: [PATCH] netfilter: xt_bpf: Fix XT_BPF_MODE_FD_PINNED mode of 'xt_bpf_info

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Message-ID: <20171009115736.GA31826@salvia>
Date:   Mon, 9 Oct 2017 13:57:36 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     Shmulik Ladkani <shmulik@...f.io>,
        netfilter-devel <netfilter-devel@...r.kernel.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Network Development <netdev@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Rafael Buchbinder <rafi@....ms>,
        Shmulik Ladkani <shmulik.ladkani@...il.com>
Subject: Re: [PATCH] netfilter: xt_bpf: Fix XT_BPF_MODE_FD_PINNED mode of
 'xt_bpf_info_v1'

On Mon, Oct 09, 2017 at 01:18:23PM +0200, Pablo Neira Ayuso wrote:
> On Fri, Oct 06, 2017 at 01:40:13PM -0400, Willem de Bruijn wrote:
> > On Fri, Oct 6, 2017 at 12:02 PM, Shmulik Ladkani <shmulik@...f.io> wrote:
> > > From: Shmulik Ladkani <shmulik.ladkani@...il.com>
> > >
> > > Commit 2c16d6033264 ("netfilter: xt_bpf: support ebpf") introduced
> > > support for attaching an eBPF object by an fd, with the
> > > 'bpf_mt_check_v1' ABI expecting the '.fd' to be specified upon each
> > > IPT_SO_SET_REPLACE call.
> > >
> > > However this breaks subsequent iptables calls:
> > >
> > >  # iptables -A INPUT -m bpf --object-pinned /sys/fs/bpf/xxx -j ACCEPT
> > >  # iptables -A INPUT -s 5.6.7.8 -j ACCEPT
> > >  iptables: Invalid argument. Run `dmesg' for more information.
> [...]
> > >
> > > References: [1] https://marc.info/?l=netfilter-devel&m=150564724607440&w=2
> > >             [2] https://marc.info/?l=netfilter-devel&m=150575727129880&w=2
> > >
> > > Cc: Pablo Neira Ayuso <pablo@...filter.org>
> > > Cc: Willem de Bruijn <willemb@...gle.com>
> > > Reported-by: Rafael Buchbinder <rafi@....ms>
> > > Signed-off-by: Shmulik Ladkani <shmulik.ladkani@...il.com>
> > 
> > Acked-by: Willem de Bruijn <willemb@...gle.com>
> 
> Applied, thanks.

Hm, I have to keep this back. Compilation breaks here.

net/netfilter/xt_bpf.c: In function ‘__bpf_mt_check_path’:
net/netfilter/xt_bpf.c:59:2: error: implicit declaration of function
‘bpf_obj_get_user’ [-Werror=implicit-function-declaration]
  fd = bpf_obj_get_user(path);
  ^